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[Appendix F] Sample Configuration File
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<H2>Using Samba</H2>
<font size="-1">
Robert Eckstein, David Collier-Brown, Peter Kelly
<br>1st Edition November 1999
<br>1-56592-449-5, Order Number: 4495
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<H1 CLASS="appendix">
<A CLASS="title" NAME="appf-10509">
F. Sample Configuration File</a></h1><P CLASS="para">This appendix gives an example of a production <I CLASS="filename">
smb.conf</i> file and looks at how many of the options are used in practice. The following is a slightly disguised version of one we used at a corporation with five Linux servers, five Windows for Workgroups clients and three NT Workstation clients:</p><PRE CLASS="programlisting">
# smb.conf -- File Server System for: 1 Example.COM  BSC &amp; Management Office 
[globals]
	workgroup = 1EG_BSC
	interfaces = 10.10.1.14/24 </pre><P CLASS="para">
We provide this service on only one of the machine's interfaces. The <CODE CLASS="literal">
interfaces</code> option sets its address and netmask, where <CODE CLASS="literal">
/24</code> is the same as using the netmask 255.255.255.0:</p><PRE CLASS="programlisting">
	comment = Samba ver. %v
	preexec = csh -c `echo /usr/samba/bin/smbclient \
                     -M %m -I %I` &amp;</pre><P CLASS="para">
We use the <KBD CLASS="command">
preexec</kbd> command to log information about all connections by machine name (<CODE CLASS="literal">%m</code>) and IP address (<CODE CLASS="literal">%I)</code>:</p><PRE CLASS="programlisting">
	# smbstatus will output various info on current status
	status = yes
	browseable = yes
	printing = bsd

	# the username that will be used for access to services
	# specified with 'guest = ok'
	guest account = samba </pre><P CLASS="para">
The default guest account was <CODE CLASS="literal">
nobody</code>, uid -1, which produced log messages on one of our machines saying "your server is being unfriendly," so we created a specific Samba guest account for browsing and printing:</p><PRE CLASS="programlisting">
	# superuser account - admin privilages to shares, with no
	# restrictions
	# WARNING - use this with care: files can be modified,
	# regardless of file permissions
	admin users = root

	# who is NOT allowed to connect to ANY service
	invalid users = @wheel, mail, deamon, adt</pre><P CLASS="para">
Daemons can't use Samba, only people. The <CODE CLASS="literal">
invalid</code> <CODE CLASS="literal">
users</code> option closes a security hole; it prevents intruders from breaking in by pretending to be a daemon process.</p><PRE CLASS="programlisting">
	# hosts that are ALLOWED or DENIED from connecting to ANY service
	hosts allow = 10.10.1.
	hosts deny = 10.10.1.6
	
	# where the lock files will be located
	lock directory = /var/lock/samba/locks
		
	# debug log files 
	# %m = separate log for each NetBIOS name (each machine)
	log file = /var/log/samba/log.%m

	# We send priority 0, 1 and 2 messages to the system logs
	syslog = 2
		
	# If a WinPopup message is sent to the server,
	# redirect it to a user via e-mail
	
	message command = /bin/mail -s 'message from #% on %m' \
						 pkelly &lt; %s; rm %s

# ---------------------------------------------------
# [globals] Performance Tuning
# ---------------------------------------------------
	
	# caching algorithm to reduce time doing getwd() calls.  
	getwd cache = yes

	socket options = TCP_NODELAY

	# tell the server whether the client is present and
	# responding in seconds
	keep alive = 60

	# num minutes of inactivity before a connection is
	# considered dead
	dead time = 30 

	read prediction = yes
	share modes = yes
	max xmit = 17384 
	read size = 512</pre><P CLASS="para">
The <CODE CLASS="literal">
share</code> <CODE CLASS="literal">
modes</code>, <CODE CLASS="literal">
max</code>, <CODE CLASS="literal">
xinit</code>, and <CODE CLASS="literal">
read</code> <CODE CLASS="literal">
size</code> options are machine-specific (see <a href="appb_01.html"><b>Appendix B, <CITE CLASS="appendix">Samba Performance Tuning</cite></b></a>): </p><PRE CLASS="programlisting">
	# locking is done by the server
	locking = yes

	# control whether dos style attributes should be mapped
	# to unix execute bits
	map hidden = yes
	map archive = yes
	map system = yes</pre><P CLASS="para">
The three <CODE CLASS="literal">
map</code> options will work only on shares with a create mode that includes the execute bits (0111). Our <CODE CLASS="literal">
homes</code> and <CODE CLASS="literal">
printers</code> shares won't honor them, but the [<CODE CLASS="literal">www]</code> share will:</p><PRE CLASS="programlisting">
# ---------------------------------------------------------
# [globals] Security and Domain Logon Services
# ---------------------------------------------------------	
# connections are made with UID and GID, not as shares
	security = user

# boolean variable that controls whether passwords
# will be encrypted
	encrypt passwords = yes
	passwd chat = &quot;*New password:*&quot; %n\r &quot;*New password (again):*&quot; %n\r \ &quot;*Password changed*&quot;
	passwd program = /usr/bin/passwd %u
	
# Always become the local master browser
	domain master = yes
	preferred master = yes
	os level = 34
	
# For domain logons to work correctly. Samba acts as a
# primary domain controller.
	domain logons = yes
	
# Logon script to run for user off the server each time
# username (%U) logs in.  Set the time, connect to shares,
# virus checks, etc.
	logon script = scripts\%U.bat

[netlogon]
	comment = &quot;Domain Logon Services&quot;
	path = /u/netlogon
	writable = yes
	create mode = 444
	guest ok = no
	volume = &quot;Network&quot;</pre><P CLASS="para">
This share, discussed in <a href="ch06_01.html"><b>Chapter 6, <CITE CLASS="chapter">Users, Security, and Domains</cite></b></a>, is required for Samba to work smoothly in a Windows NT domain:</p><PRE CLASS="programlisting">
# -----------------------------------------------------------
# [homes] User Home Directories
# -----------------------------------------------------------
[homes]
	comment = &quot;Home Directory for : %u &quot;
	path = /u/users/%u</pre><P CLASS="para">
The password file of the Samba server specifies each person's home directory as   <EM CLASS="emphasis">
/home/</em><CODE CLASS="replaceable"><I>machine_name</i></code><EM CLASS="emphasis">/</em><CODE CLASS="replaceable"><I>person</i></code>, which NFS converts to point to the actual physicl location under <EM CLASS="emphasis">
/u/users</em>. The <CODE CLASS="literal">
path</code> option in the <CODE CLASS="literal">
[homes]</code> share tells Samba the actual (non-NFS) location:</p><PRE CLASS="programlisting">
	guest ok = no
	read only = no
	create mode = 644
	writable = yes
	browseable = no 

# -----------------------------------------------------------
# [printers] System Printers
# -----------------------------------------------------------
[printers]
	comment = &quot;Printers&quot;
	path = /var/spool/lpd/samba
	printcap name = /etc/printcap
	printable = yes
	public = no 
	writable = no

	lpq command = /usr/bin/lpq -P%p
	lprm command = /usr/bin/lprm -P%p %j
	lppause command = /usr/sbin/lpc stop %p
	lpresume command = /usr/sbin/lpc start %p

	create mode = 0700

	browseable = no 
	load printers = yes  

# -----------------------------------------------------------
# Specific Descriptions: [programs] [data] [retail]
# -----------------------------------------------------------
[programs]
	comment = &quot;Shared Programs %T&quot;
	volume = &quot;programs&quot;</pre><P CLASS="para">
Shared Programs shows up in the Network Neighborhood, and <CODE CLASS="literal">
programs</code> is the volume name you specify when an installation program wants to know the label of the CD-ROM from which it thinks it's loading:</p><PRE CLASS="programlisting">
	path = /u/programs
	public = yes
	writeable = yes
	printable = no
	create mode = 664
[cdrom]
	comment = &quot;Unix CDROM&quot;
	path = /u/cdrom
	public = no 
	writeable = no 
	printable = no
	volume = &quot;cdrom&quot;

[data]
	comment =  &quot;Data Directories %T&quot;
	path = /u/data
	public = no
	create mode = 770
	writeable = yes
	volume = &quot;data&quot;

[nt4]
	comment =  &quot;NT4 Server&quot;
	path = /u/systems/nt4
	public = yes 
	create mode = 770
	writeable = yes
	volume = &quot;nt4_server&quot;

[www]
	comment =  &quot;WWW System&quot;
	path = /usr/www/http
	public = yes 
	create mode = 775
	writeable = yes
	volume = &quot;www_system&quot;</pre><P CLASS="para">
The <CODE CLASS="literal">
[www]</code> share is the directory used on the Unix server to serve web pages. Samba makes the directory available to local PC users so the art department can update web pages.</p></div></blockquote>
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